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Outlet model available

Polk's LSi M 706c is more than capable of handling the heavy lifting required of a center channel speaker in a high-performance home theater system. It delivers the kind of effortlessly wide, deep soundstage and realistic imaging that puts you in the middle of the on-screen action.

High-performance center channel sound for heavy-hitting home theater

Polk's LSi M 706c is more than capable of handling the heavy lifting required of a center channel speaker in a high-performance home theater system. It delivers the kind of effortlessly wide, deep soundstage and realistic imaging that puts you in the middle of the on-screen action.

You'll hear conversations between your favorite movie or TV show characters with pinpoint detail, complemented by special effects that cover the range from surprisingly deep bass to the most delicate highs. Building upon the widely acclaimed LSi family of speakers, the LSi M series incorporates the latest developments in speaker technology, fitted into a newly designed enclosure that's beautifully sculpted and luxuriously finished.

Polk's Dynamic Sonic Engine: The speaker within a speaker

Like all LSi M models, the '706c center channel speaker uses Polk's Dynamic Sonic Engine. Made up of a 3-1/4" midrange driver and a 1" ring radiator tweeter in its own acoustically sealed enclosure, this tightly spaced duo acts like a "mini-monitor." The precise alignment of the midrange and tweeter allows them to disperse sound over a wide, uniform area with excellent off-axis response in the critical 200 Hz to 2,000 Hz midrange.

The ring radiator tweeter features several improvements from the version in the earlier LSi line. A slight reshaping of the tweeter's bullet-shaped phase plug allows it to move even farther out of the baffle, while a redesigned diaphragm has made the tweeter even more efficient.

It even has its own tuned enclosure within the Dynamic Sonic Engine. These changes result in higher power handling, extended dynamic range, improved dispersion, and extended high-frequency response — all the way up to 30,000 Hz!

Advanced driver material for even more realistic sound

The original LSi speakers featured a light, stiff mineral-filled polypropylene cone that was "puffed up" with injected air to form a honeycomb-like structure. The new super cell aerated polypropylene uses larger "puffed cells" to create a cone material that's thicker yet lighter than the original. It's used in both the midrange and woofers, allowing them to move faster and with more efficiency.

This speaker also uses proprietary Orth Crossovers to send the right frequencies to the right drivers, making it extremely efficient and easier for your receiver or amplifier to drive.

PowerPort® technology for smooth, deep bass

Like all LSi M speakers, the dual 6-1/2" woofers each have their own PowerPort. Designed exclusively by Polk, this specially shaped "cone" at the mouth of the bass port directs moving air to eliminate bass-stealing turbulence. No turbulence means no wasted power, which means more efficient bass response.

Careful cabinet design with a stunning real wood veneer

The '706c cabinet is made of heavily braced 3/4" thick MDF with an even thicker front baffle (1-1/4") to keep distortion to a minimum. Each driver has its own separate, non-parallel chamber to increase their efficiency and eliminate internal resonances and standing waves. Dual gold-plated binding posts let you bi-amp or bi-wire this speaker for even better performance.

The magnetic grille easily snaps on and off, and it measures less than 1mm thick, so it won't interfere with the sound. And finally, the cabinet is finished with a furniture-grade, real-wood veneer that's hand-polished to achieve a gorgeous glow in your home.

Complete your home theater system

Achieve startling realism and seamless surround effects when you build a complete LSi M system. All LSi M models feature the same components and tuning, so you can combine the '706c center channel with any combination of bookshelf or floor-standing speakers in the front of your room, and either additional bookshelf speakers or dedicated surround speakers in the back of your room for wraparound sound effects.

Very robust center channel

Normally I wait for a speaker to be broken in to write a review. In this case I am skipping that step as the 706c is so crystal-clear and nuanced that we are simply amazed. My wife even commented on how clear vocals and songs are. We had the 704c prior to this, and while it was a good speaker, it pales in comparison to the 706c. Overall we are very happy with this center channel !

Pros:Clarity of sound, Mid-range and Highs are fantastic. Bass is accurate and tight. Fit & finish is first class!

Cons:None

1 of 1 found this helpful

Very nice speaker

This is a great center channel, but to get the best results, it needs to be paired with a really powerful amp or receiver to make it shine. It sounds good with my Yamaha 730 (90 watts per channel), but it sounds awesome with the Yamaha 2030 (140 watts per channel). You really need a an powerful amp or receiver to drive this speaker if you want to hear its full potential and for the cost, I want to hear all that it can produce. I am using it with my polk RTI8 fronts for now and it blends in fine with them. I was concerned that the it would stand out and make my RTi8s sound less than good, or sound noticeably different, but it has improved my HT listening and movie watching very nicely. I bought this speaker with the intention of moving my polk lsim 703 bookshelf speakers to my HT, but I am no hurry to move them from my two channel set up at this point since, my system sounds fine as is. I am very happy with this speaker.

Pros:Sounds awesome and does everything you want a center channel to do.

Music and movie magic

This center channel is incredible and massive. I cant find anything thing to complain about. Looking forward to watching movies and listening to music !!

Pros:Amazing sound!

Cons:None

1 of 1 found this helpful

Polk LSiM706c Center Channel Speaker - Best in Class

robm2007 from Jacksonville, FL on 4/13/2016

This is the best center channel speaker out there, especially when purchasing them during the recent half off sale. It has a very clear vocal sound for listening to movies, or music, and the 250 watts power handling capability does exceptionally well listening to reasonable high volume levels. I suppose there are better quality speakers out there with higher wattage at more expense, but this one fills a large 20 x 20 foot room with no problem. It is the top of it's class. You won't be disappointed.

Killer Center Speaker

Just amazing. I have used mostly Polk products over the last 30 years and they have really stepped up on this one. The dialogue on my Blue Rays and DVD's is really clear and realistic. I can control how much I want through my Marantz SR 7007. This completes my HT system as I am running LiSM703s in the rear and LiSM 705's in front. I have a Klipsch RW2D sub. A little overkill for these Polk's. Highly recommend.

Pros:As I said, very clear dialogue. Beautiful mahogany exterior.

Cons:It may be a bit heavy. You could not wall or ceiling mount this beast. Technically no cons.

Product Research

Driver Technology

Performance Objectives of the Polk Audio LSiM Series Loudspeakers: The
LSiM series loudspeaker is Polk Audio's best high-performance loudspeaker. Polk
Audio designed the LSiM series loudspeakers to create a sound that virtually
transports you to the scene of the recorded performance. It was engineered &
created with the following performance objectives in mind.

Pleasing tonality, even during extended listening at
performance levels.

Enhanced Ring Radiator Tweeter: The ring radiator tweeter was a vital
element in the success of Polk Audio's original LSi Series. Polk Audio engineers
have made some nuanced improvements in the design of this tweeter. First, they
reshaped the tweeter's bullet-shaped phase plug, allowing it to move farther out
of the baffle, improving dispersion and eliminating horn-loading. Next, they
opened up the tweeter's face-plate, then redesigned the tweeter's diaphragm roll
to make it more efficient and improve dispersion even more. Finally, they gave
the new ring radiator tweeter its own tuned enclosure (Dynamic Sonic Engine).
This new ring radiator tweeter boasts higher power handling, extended dynamic
range, improved dispersion and extended top-end response.

Super Cell Aerated Polypropylene (APP) Cone Woofer: If the perfect
cone material is lightweight (for faster, more efficient action) and stiff (for
less distortion-causing flex), with enough internal damping to suppress and
offset any limitations of its lightweight stiffness, then the Super Cell APP
Cone Material is about as perfect as cone material gets. Aerated Polypropylene
(APP) is a mineral-filled polypropylene material that's been "puffed up" with
injected air to form a honey-comb structure. Polk Audio's original APP cone
approached the ideal balance of lightweight stiffness with high damping, along
with good resistance to moisture, UV and temperature extremes. Next generation
LSiM series loudspeakers employ Polk Audio's next generation of APP Super Cell.
In Super Cell APP, the "puffed cells" are larger, for a thicker cone material
that actually has less mass than the original APP material. Super Cell APP has
larger cells, for lighter weight and more inherent damping, plus uncompromised
stiffness, for unsurpassed transient response and resonance suppression.

Extended Linear Motion Voice Coils: Allowing lots of movement in a
limited space, ELM Voice Coils power the LSiM series speaker's mid-range &
mid-woofer drivers to extend their higher-frequency response with much less
impedance.

Enclosure Design

MDF Enclosure: The enclosure is an integral part of the sound design
of the Polk Audio LSiM series loudspeaker. All LSiM cabinets are made of .75"
MDF, with wide-radius baffles of robust 1.25" MDF. Substantial internal bracing
(each driver has its own separate non-parallel chamber) increases efficiency and
banishes internal resonances & standing waves, for high power handling and
incredible smoothness. Wide-radius baffles, along with zero-diffraction magnetic
grilles, help stabilize imaging for a very wide, well-defined soundstage.

Dynamic Sonic Engine (DSE): At the heart of the Polk Audio LSiM series
center channel speaker is an enclosure-within-the-enclosure design (known as the
Dynamic Sonic Engine) that houses the mid-range driver & the ring radiator
tweeter. Molded into one rigid piece, the DSE enclosure tapers to a "turbine"
that reduces back-wave reflections. The DSE combines its two speakers in an
aligned, optimized array for wide, uniform dispersion in the critical 200Hz-2kHz
midrange, improving transient response. The combination delivers exact
timbre-matching, improved high-frequency dispersion and greater horizontal
off-axis response.

Note: The ring radiator tweeter & midrange driver are
housed in a separate internal sealed enclosure from the ported enclosure
which houses the two midbass woofers.

PowerPort Bass Venting: PowerPort Bass Venting is a Patented Polk
Audio technology that uses a specially designed "cone" at the mouth of the bass
port to direct moving air as it exits the port. Air moving out of a bass port
creates turbulence, which can result in boomy distortion & "port noise",
especially at high volume. This distortion can cause bass output losses up to
3dB, wasting lots of amp power. To eliminate bass-stealing turbulence at the
mouth of the port, Polk Audio engineers designed the PowerPort. It's unique
shape promotes "laminar" airflow even in short tube ports by mimicking the
properties of longer, flared port openings. No turbulence means no wasted power,
which means more efficient bass response.

Bi-Wiring/Bi-Amping: Using the dual posts, you can bi-wire or bi-amp
the speaker. Bi-wiring or bi-amping the speaker provides improved bass & treble
performance. If you decide to bi-wire or bi-amp, you must remove the jumpers between the terminal posts (failure to do this could result
in damage to your amplifier and loudspeakers).

Bi-Wiring: Bi-wiring can provide
noticeable improvements in the overall transparency of your loudspeakers.
Run separate speaker wires to the low & high frequency drivers from a single
amplifier (the upper set of binding posts are for the high frequency
drivers; the lower set of binding posts are for the low frequency drivers).

Bi-Amping: Bi-amping allows you to use
separate amplifiers for the high & low frequency sections of your
loudspeaker for greater dynamic range & lower distortion. We recommend that
your separate amplifiers have identical gain to preserve the speaker's
voicing balance.

Mounting Options

Placement: With today's modern flat-panel TVs, the most
popular placement, and our recommendation for your center channel speaker, is
beneath your TV screen. You may also place the center channel speaker above your
TV, should you choose. The LSiM center channel loudspeaker is very heavy (42.3
lbs) and we do not recommend wall mounting it, unless placed on a sturdy shelf.

Note: The LSiM center channel speaker is not
magnetically shielded.

Rubber Feet: The center-channel speaker comes with 4
self-adhesive rubber feet so it will sit securely on your stand or shelf.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.